The Malfoys made their money fair and square. They might have gotten some in the past by hexing or enchanting Muggles but not Lucius. Because Lucius was not part of a criminal organization. He was part of a radical fascist political movement. Weasley were just poor with personal finance.

Obviously when you think about it for a bit, the Malfoys' money were probably ill-gotten in the first place and they had ulterior motives, and Mr. Weasley probably wouldn't help Ludo Bagman's brother if he did something really wrong, but it's funny that we just directly go to thinking ill of Mr. Malfoy and good of Mr. Weasley despite their actual actions being the opposite of that.

When taken at face value, the Malfoys got their World Cup tickets for charity, whereas the Weasleys got theirs for possibly illegal nepotistic law-bending.